1940

6.4

1963

7.1

1942

6.4

1955

5.5

1930

7.4

1950

5.6

1933

6.3

1934

5.8

1935

5.1

1951

6.5

1926

5.5

1943

3.9

1936

6.5

1953

5.1

1952

5.8

1956

5.1

1954

5.9

1967

7.6

1963

7.2

1960

5.0